Jonathan j



(No Model.) J. J. MOORE.

STEAM BOILER.

No. 393,781. Patented Dec. 4, 1888.

UNITED STATES PATENT OFFICE.

JONATHAN J. MOORE, OF THORNTOVVN, INDIANA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 393,781, dated December4, 1888.

Application filed June 11, 1888. Serial No. 276,678. (No model.) I

To all whom it may concern.-

Be it known that I, JONATHAN J. MOORE, a citizen of the United States,residing at Thorntown, in the county of Boone and State of Indiana, haveinvented a new and useful Improvement in Steam-Boilers, of which thefollowing is a specification.

My invention relates to an improvement in steam-boilers of that classwhich have an internal firebox.

The object of my improvement is to provide a grate for the fire-box inthis class of steam-boilers which shall also form a part of thesteam-generating surface.

The accompanying drawings illustrate my invention.

Figure 1 represents a longitudinal section of a locomotive or portableboiler having my improvement. Fig. 2 is a plan of the same at a, Fig. 1.

My improvement consists in forming a part of the bottom of the fire-boxof a solid inclined surface formed by bending the back sheet of thefire-box forward and downward, and in forming the grate of tubes havingtheir open ends inserted in the back sheet of the fire-box, the saidtubes being arranged in the same horizontal plane, with open spacesbetween them, so as to form a grate-surface, whereby the fuel-supportconsists of a smooth inclined surface from which the coals and asheswill slide forward and a grate formed by the tubes and which forms apart of the water-space of the boiler, all as hereinafter 5 fullydescribed.

bent forward at a sharp angle, as at c, immediately above the pointwhere the tubular grate-bars D are inserted, thus forming a partialsupport for the fuel. The closed ends 6 of the tubes D extend nearly tothe front wall of the fire-box, but are not secured thereto, the purposebeing to avoid any pressure on the walls of the fire-box from theexpansion of the gratebars. For greater security the forward ends of thebars D may rest on a cross-bar, f, secured to the side walls of thefire-box. The open ends of the tubes D are screwed into the back sheetof the fire-box, so that their interiors communicate with and form apart of the water-space which surrounds the firebox. By thisconstruction all warping and twisting and burning of the grate-bars isavoided. A large proportion of heat which has heretofore been lost inthe ash-pit is absorbed by the tubular grate-bars and the inclinedportion of the back sheet which forms an extension of the grate and isutilized in the production of steam.

I claim as my invention In a steanrboiler, the combination of aninternal fire-box having its back sheet inclined forward and downwardand a series of ,tubes each having one end inserted in said back sheetof the fire-box below said inclined portion and arranged to form a gratefor the fire- -boX, all substantially as and for the purpose specified.v

JONATHAN J. MOORE.

'itn esses:

WILLIAM A. MAsTERs, D. H. RAMMEL.

